. Bulletin of the United States Geological Survey--The Santa Clara Valley, Puente Hills and Los Angeles Oil Districts. s of heavy conglomerate that lie at the base and summitof this format ion in the region of Wiley and other canyons to thewest. Unconformity between the two formations probably exists,although angular discrepancies were not detected at any point inthe Pico region. The absence, however, of the heavy mass of sili-ceous shale between theVaqueros and the Fernando beds along thelower northern slopes of the Santa Susana Mountains is of the Oak Ridge-South Mountain an
. Bulletin of the United States Geological Survey--The Santa Clara Valley, Puente Hills and Los Angeles Oil Districts. s of heavy conglomerate that lie at the base and summitof this format ion in the region of Wiley and other canyons to thewest. Unconformity between the two formations probably exists,although angular discrepancies were not detected at any point inthe Pico region. The absence, however, of the heavy mass of sili-ceous shale between theVaqueros and the Fernando beds along thelower northern slopes of the Santa Susana Mountains is of the Oak Ridge-South Mountain anticline, in the lofty upperescarpments, this shale attains a thickness of 300 to 500 feet andseparates the Vaqueros from the Fernando conglomerate and sand-stone on the southern slopes of the mountains. The absence of thesiliceous shale in one locality and its presence in the other, not-withstanding the short interval between the two, suggest uncon-formity between the Fernando and the underlying beds. Moreover]t here are several areas over which disl inct unconformil v is observable. Main ridge Peak east ofFryers. Fig. 10. Section through Fryers Peak east of Fryers ranch. Dots represenl sandstone; fine lines, shale; a, b, bods of shale. The Pico anticline has proved one of the most productive folds inl he Santa Clara Valley. It exhibits marked regularity; the foldmaintains a comparatively uniform elevation from west to east fornearly its entire length, and the beds involved are of uniform textureand uniformly disposed with reference to oik4 another and to theaxis of the fold. Flic inference seems natural, therefore, that suchconditions would be favorable to the extended field that has beendeveloped. The northern slope of the Santa Susana Mountains presents con-siderable regularity in the succession of beds from the crest nearlyto the line of the Pico oil field, but to the south of the crest, especiallyin the area opposite the Salt Creek drainage and the more easterlytributaries
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